Elevator-door.



No; 723,708. PATENTED MAR. 4, 19.03.

E. MoOLURE'.

ELEVATOR DOOR.

APPLICATION FILED DEC. 19, 1902.

N0 MODEL.

Tu: norms FEYERS c0. PnoroLrrMQ. WASHXNGTON, u c

NITED STATES PATENT QFFICE.

EDWARD MCCLURE, on CHICAGO, ILLINOIS, ASSIGNOR on ONE-HALF TO FRANKLINP. SMITH, OF CHICAGO, ILLINOIS.

ELEVATOR-DOOR.

SPECIFICATION forming part of Letters Patent No. 723,708, dated March24, 1903.,

Application filed December 19, 1902. Serial No. 135,863. tNo model.)

To all whom itmay concern:

Be it known that I, EDWARD MOCLURE, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inElevator-Doors, of which the following is a specification.

Myinvention relates to certain new and useful improvements inelevator-doors; and its object is to produce a device of the classwherein one of two sliding doors moves behind the other, both doorsbeing moved by any force acting on one of them. v

To this end my invention consists in certain novel features ofconstruction, which are clearly illustrated in the accompanying drawingsand described in this specification.

In the aforesaid drawings, Figure 1 is an elevation of my improved doorsand a portion of the inclosure looking from the inside of theelevator-well. Fig. 2 is a horizontal section in the line 22 of Fig. 1;and Fig. 3 is a view similar to Fig. 1, showing the doors in an openposition.

Referring to the drawings, A and B are two sliding doors running onhangers a, and b, respectively. Both doors slide to the right looking atthem as in Fig. 1, and the door A in that position slides behind thedoor B.

The door A is provided with a rail A towardthe lower part of its1eft-hand edge, the rail forming with the contiguous'edge of the door Aa vertical guideway.

(3 indicates the wall of theinclosure, in

which is a doorway which the doors close, and

avertically-extending bar 0 is provided adjacent to the right-hand edgeof the door B,

which is provided with a rail 0, which forms with the contiguous edge ofthe bar 0 avertical guideway. A leverD is pivoted between its ends uponthe door B. The opposite ends of the lever D are curved in oppositedirections, so that when the body of the lever is horizontal one end isabove and one is below' the pivot. The lever bears at its ends rollers dd, which run in the guideways formed between the door and the rail A andthe bar and the rail 0, respectively.

The operation of the device will be readily apparent. When it is desiredto open the doors, the door A is pushed to the right. This forces downthe left-hand end ofthe lever D, the roller (1' running along theguideway.- Simultaneously, of course,the right-hand end of the lever israised, and the roller 61 runs up -in its guideway.

This tends to swing the three points-that is, the two rollers and thefulcrum of the lever-into the same vertical line. As the door A iscontinuously pushed to the right, the lever swings toward a verticalline and the twodoors are simultaneously opened, the door A moving at agreater speed than the door B. The lever D, as shown in the drawings, istoo nearly at right angles to the edge of the door when the doors areclosed to permit them to be readily opened; but it can be very readilystarted by pushing down on the left-hand end. I consider this a greatadvantage, for the reason that it is desirable to have a device whichsynchronizes the movements of the two doors where it can be grasped andstarted by hand. Another advantage of this structure lies in the factthat when the lever lies too near the horizontal to permit the doors tobe opened without first starting the lever the lever forms an automaticlock for the doors. Still a further advantage of the device lies in thefact that it can readily be accommodated to a greater number ofsliding-door leaves by merely adding guideways to the additional leavesand corresponding rollers on the lever.

I realize that considerable variation can be made in the details of thisconstruction, and for this reason I do not wish to limit myself to thespecific form herein set forth.

I claim as new and-desire to secure by Letters Patent- 1. In a device ofthe class described,- the combination with a suitable wallhaving adoorway and a plurality of doors adapted to close the doorway, andslidable one behind the other to open the same, of a lever ful, crumedbetween its ends on the slow door and in running engagement with thewall and the fast door, said lever,when the doors are closed, being toonearly at right angles to the edge of the door to permit the doors to bereadily opened, except by moving the lever.

2. The combination with a suitable wall having a doorway and a pair ofdoors, slidable one behind the other to open the same,

of vertical guideways on the Wall and fast the county of Cook and Stateof Illinois, this door respectively and eleven pivoted between 12th dayof December, A. D. 1902. its ends to the slow door and havin a, runningengagement with said guidewg s, suh- EDVARD MCCLURE' stantiaily asdescribed. \Vitn'esses:

In Witness whereof I have signed the above CHAS. O. SHERVEY, applicationfor Letters Patent at Chicago, in RUSSELL \VILES.

